The disavow tool is automatic for any algorithmic rankings (such as Penguin and Panda). If you have a manual webspam action, then you should get a notice after

The disavow tool is automatic for any algorithmic rankings (such as Penguin and Panda). If you have a manual webspam action, then you should get a notice after you verify your site at google.com/webmasters . In the case of a manual webspam action, our advice is try to get any spammy links that you put on the web taken down. If there are some spammy links that you can't get taken down off the web, you can use the disavow tool for those remaining links and then do a reconsideration request.